Hi, Everything in the discussion between Eugenio and Matt is stuff I agree with, except ... When I rewrote Artemis, one of the motivations was that I wanted to write my own pathfinder rather than to continue using the one in Feff. My main motivation was fuzzy degeneracy (http://bruceravel.github.io/demeter/artug/extended/fuzzy.html) plus I wanted to correct a few other things I saw as shortcomings. When I was writing it years ago, I didn't immediately see an easy way to consider polarization correctly while also doing fuzzy degeneracy correctly. I have since figured that out, but years went by and only one person ever asked me about polarized feff calculations in Artemis. So I never implemented it. It's a funny thing, when you wait for a bus, none comes, then two show up at once. A month ago, I was asked about polarization in Artemis, and now Eugenio brings it up! Polarization works (although it needs testing) in the very latest code in github. But I did that work since the last time I built a Windows installer. Ellipticity does not yet work (in Artemis -- it works just fine in Feff, but Artemis does not deliver the ellipticity-dependent calculation to the user). Anyway, I will try to find a few hours this week to build a new Windows installer, which will included the ability to consider linear polarization.
Artemis used to make this very easy (sum paths without fitting), but I don't recall how to do this in the latest version.
Still is easy. Well, I think it is. YMMV :) http://bruceravel.github.io/demeter/artug/plot/vpaths.html B -- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Science Group at NSLS-II Building 535A Upton NY, 11973 Homepage: http://bruceravel.github.io/home/ Software: https://github.com/bruceravel Demeter: http://bruceravel.github.io/demeter/